DVCH2800D Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
DESCRIPTION
The DVCH series of high reliability DC-DC
converters is operable over the full military (-55 °C to
+125 °C) temperature range with no power
derating. Unique to the DVCH series are robust and
effective input and output filters which provide
dramatically reduced input and output noise
performance when compared to other manufacturers
competing devices. Operating at a nominal fixed
frequency of 400 kHz, these regulated, isolated units
utilize a high speed magnetic feedback design and
well controlled undervoltage lockout circuitry to
eliminate slow start-up problems.
These converters are designed and manufactured in
a facility qualified to ISO9001 and certified to MIL-
PRF-38534 and MIL-STD-883.
This product may incorporate one or more of the
following U.S. patents:
5,784,266
5,790,389
5,963,438
5,999,433
6,005,780
6,084,792
6,118,673
FEATURES
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High Reliability
Very Low Output Noise
Wide Input Voltage Range: 12 to 50 Volts per
MIL-STD-704
Up to 1.5 Watts Output Power
Fault Tolerant Magnetic Feedback Circuit
NO Use of Optoisolators
Undervoltage Lockout
Indefinite Short Circuit Protection
Current Limit Protection
Industry Standard Pinout
High Input Transient Voltage: 80 Volts for 1 sec
per MIL-STD-704A
Precision Projection Welded Hermetic Package
High Power Density: > 7 W/in
3
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461 Revisions C, D, E and F
EMC Requirements When Used With VPT’s
EMI Filters
MIL-PRF-38534 Element Evaluated
Components
Space Applications should consider VPT’s “S”
Series of Radiation Tolerant Power Conversion
Devices. Contact VPT for details.
Figure 1
– DVCH2800D DC-DC Converter
(Exact
marking may differ from that shown)
DVCH2800D-5.0
http://www.vpt-inc.com
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
1
DVCH2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
1
Output Power
Power Dissipation (Full Load, T
CASE
= +125°C)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
1.5 Watts
0.6 Watts
3A
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+5°C
-65°C to +150°C
270°C
11 Grams
Parameter
STATIC
INPUT
Voltage
4
Current
Ripple Current
Inhibit Pin Input
4
Inhibit Pin Open Circuit Voltage
UVLO Turn On
OUTPUT
Voltage
Power
3
Current
3
4
Conditions
DVCH2805D
Min
12
-
-
-
-
0
8.0
6.5
DVCH2812D
Max
50
80
3.5
10
30
1.5
11.0
11.5
5.05
5.20
1.5
1.2
0.24
50
150
400
250
-
3
4
500
475
-
-
300
500
400
600
20
25
Typ
28
-
-
-
-
-
9.0
-
5.00
5.00
-
-
-
-
-
-
-
79
-
-
-
400
-
841
100
200
200
400
15
0
Min
12
-
-
-
-
0
8.0
6.5
11.88
11.52
0
0
0
-
-
-
-
74
-
-
-
325
100
-
-
-
-
-
-
-
Typ
28
-
-
-
-
-
9.0
-
12.0
12.0
-
-
-
-
-
-
-
79
-
-
-
400
-
841
100
100
300
300
15
0
Max
50
80
3.5
12
30
1.5
11.0
11.5
12.12
12.48
1.5
1.2
0.1
100
150
700
250
-
3
4.5
200
475
-
-
300
400
600
600
20
50
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
mV
PK
µSec
mV
PK
µSec
mSec
mV
PK
±V
OUT
±V
OUT
Total
±V
OUT
I
OUT
±V
OUT
±V
OUT
±V
OUT
±V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
Either Output
Either Output
Full Load, 20Hz to 10MHz
V
IN
= 12V to 50V
10% Load to Full Load
50% Load to Full Load
Overload
4
4.95
4.80
0
0
0
-
-
-
-
72
-
-
-
325
Ripple Voltage
Line Regulation
Load Regulation
Load Regulation
EFFICIENCY
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
SWITCHING FREQUENCY
ISOLATION
MTBF (MIL-HDBK-217F)
Short Circuit
500 V
DC
AIF @ T
C
= 55°C
±V
OUT
±V
OUT
±V
OUT
100
-
-
-
-
-
-
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
2
4
Half Load to Full Load
V
IN
= 12V to 50V
V
IN
= 0V to 28V
Line Step Output Transient
Line Step Recovery
2, 4
Turn On Delay
Turn On Overshoot
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DVCH2800D-5.0
2
DVCH2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
1
Output Power
Power Dissipation (Full Load, T
CASE
= +125°C)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
1.5 Watts
0.6 Watts
3A
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+5°C
-65°C to +150°C
270°C
11 Grams
Parameter
STATIC
INPUT
Voltage
4
Current
Ripple Current
Inhibit Pin Input
4
Inhibit Pin Open Circuit Voltage
UVLO Turn On
OUTPUT
Voltage
Power
3
Current
3
4
Conditions
DVCH2815D
Min
12
-
-
-
-
0
8.0
6.5
Typ
28
-
-
-
-
-
9.0
-
15.0
15.0
-
-
-
-
-
-
-
79
-
-
-
400
-
841
100
100
300
300
15
0
Max
50
80
3.5
14
30
1.5
11.0
11.5
15.15
15.60
1.5
1.2
0.08
100
150
700
250
-
3
4.5
200
475
-
-
300
400
600
600
20
50
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
mV
PK
µSec
mV
PK
µSec
mSec
mV
PK
±V
OUT
±V
OUT
Total
±V
OUT
I
OUT
±V
OUT
±V
OUT
±V
OUT
±V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
Either Output
Either Output
Full Load, 20Hz to 10MHz
V
IN
= 12V to 50V
10% Load to Full Load
50% Load to Full Load
Overload
4
14.85
14.40
0
0
0
-
-
-
-
74
-
-
-
325
Ripple Voltage
Line Regulation
Load Regulation
Load Regulation
EFFICIENCY
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
SWITCHING FREQUENCY
ISOLATION
MTBF (MIL-HDBK-217F)
Short Circuit
500 V
DC
AIF @ T
C
= 55°C
±V
OUT
±V
OUT
±V
OUT
100
-
-
-
-
-
-
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
2
4
Half Load to Full Load
V
IN
= 12V to 50V
V
IN
= 0V to 28V
Line Step Output Transient
Line Step Recovery
2, 4
Turn On Delay
Turn On Overshoot
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DVCH2800D-5.0
3
DVCH2800D Series
BLOCK DIAGRAM
PIN 1
28V IN
L1
C1
IN COM
PIN 2
Q1
T1
D1
C2
OUT COM
PIN 4
-VOUT
PIN 6
PIN 3
+V OUT
C3
D2
UNDER
VOLTAGE
SHUTDOW
N
PWM
CONTROL
Rs1
PRIMARY
HOUSEKEEPING
SUPPLY
INH
PIN 7
VOLTAGE
AMPLIFIER
Figure 2
CONNECTION DIAGRAM
1
28 Vdc
28V IN
+V OUT
3
LOAD
+
-
7
INH
OUT COM
4
2
IN COM
-V OUT
6
LOAD
Figure 3
DVCH2800D-5.0
4
DVCH2800D Series
INHIBIT DRIVE CONNECTION DIAGRAMS
28V IN 1
12K
INH 7
OPTIONAL
CAPACITOR
IN COM 2
BIAS
28V IN 1
12K
OPTOISOLATOR
INH 7
OPTIONAL
CAPACITOR
IN COM 2
BIAS
12V
12V
Figure 4
– Internal Inhibit Circuit and Recommended Drive
(Shown with optional capacitor for turn-on delay)
Figure 5
– Isolated Inhibit Drive
(Shown with optional capacitor for turn-on delay)
EMI FILTER HOOKUP DIAGRAM
DVMSA28 EMI FILTER
1
28 Vdc
28V IN
28V OUT
2,3
DVCH2800D DC-DC CONVERTER
1
28V IN
+V OUT
3
LOAD
+
-
7
INH
OUT COM
4
7
IN COM OUT COM
4,8
5,6
CASE
2
IN COM
5
-V OUT
6
LOAD
Figure 6
– Converter with EMI Filter
DVCH2800D-5.0
5
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